Question

A concave mirrorproduces three times enlarged virtual image of an object placed at 10 cm in front of it . calculate the radius of carvature of image.

Answer 1

u= -10cmm=+3= -v/u=)
v=30cm
1/f=1/v+1/u=)
1/f=u+v/uv=)

1/f
= -10+30/-300=20/-300=)
f= -15cm
R=2f= -30cm